Shaft-alining device



- L. BJCOBB.

SHAFT ALINING DEVICE.

APPLICATION men NOV. 14, 1919.

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UNITED STATES PATENT OFFICE.

LEANDER B. COBB, OF POBTLAND, MAINE; JULIA L. COBB, EXECUTRIX OF THEESTATE OF SAID LEANDER B. COBB, DECEASED, ASSIGNOR OF ONE-HALF T0WILLIAM B.

COBB, OF CLEVELAND, OHIO.

SHAFT-ALININ Gr DEVICE.

Specification of Letters Patent. Patented May 11, 1920.

Application filed November 14, 1919. Serial No. 338,100.

To all whom it may concern:

Be it known that I, LEANDER B. COBB, a citizen of the United States,residing at Portland, in the county of Cumberland and State of Maine,have invented certain new and useful Improvements in Shaft-AliningDevices, of which the following is a specification.

This invention relates to improvements in mechanism for determining theposition for a shaft which is to be coupled to a fixed shaft. It isespecially designed to be used in connection with the alining of anengine shaft to be coupled to the propeller. shaft of a ship which isset before the same is launched and coupled to the engine shaftafterward. It may, however, be used wherever it is necessary to alineone shaft to another shaft that is already set.

In the drawings herewith accompan ing and making a part of thisapplication, 4 igure 1 is a plan View partly in horizontal section of mydevice attached to the end of a propeller shaft of a vessel showing alsothe end of the engine shaft to which the propeller shaft is to becoupled; Fig. 2 is a plan view of the coupling which attaches thealining bracket to the propeller shaft; Fig. 3 is an end view of thepeep hole and Fig. 4 is an end view of the cross wire of the peep andsight tube.

The same reference characters indicate like parts in the severalfigures.

In said drawings, 1 represents a propeller shaft; 2 the coupling endthereof; 3 the lathe center in the coupling end and 4 represents theshaft to be alined; 5 the coupling end thereof and 6 the lathe center inthe coupling end.

My improvement consists, among other things, in a bracket 7 adapted tobe secured to the end of shaft 1 by means of a coupling which consistsof a base 8 having a threaded projection 9 adapted to take into athreaded opening 10 in the end of the bracket. The base 8 and projection9 have an offset engagement, as seen at 11. This offset is not threadedfor a reason hereafter set out. The part 9 carries a centering screw 13having a tapering point l'to center in the lathe center in the end ofthe shaft, thereby positively centering the tube in the bracket upon thepropeller shaft with the lathe center. The coupling part 8 is fastenedto the end of the propeller shaft by bolts 15 passing through theflanged end of the shaft and through bonding plates 16, one end of whichengages the part 8 and the other a stud 17 between the plate and the endof the shaft. There may be a series of these bonding plates. Mounted inthe bracket concentric with the point of the screw 13 and the lathecenter of the shaft is a peep and sight tube 18, the end of the tubetoward the stationary shaft having a peep hole 19 and the other endhaving cross wire 20.

In operation, after the bracket is secured to the end of the stationaryshaft, as shown in Fig. 1, the eye is applied to the peep end of thepeep and sight tube and the point which corresponds to the point ofcrossing of the wire will indicate the position for the lathe center inthe shaft to be alined to be placed. This may be done by any wellknownmeans of handling and positioning shafting.

It is noted that the bracket, by reason of the non-threaded offset jointbetween 8 and 9, as seen at 11, may be rotated so that the opening 20 inthe bracket may be vertical, horizontal or in any intermediate positionto convenience the application of the eye to the peep hole. The pointindicated through the peep and sight tube may be fixed by lookingthrough the tube, by a shadow cast by a light or by a mark made by aprojectile shot therethrough.

I claim 1. In a shaft alining device, a bracket carrying a sighting tubehaving means for establishing a sight line therein and means formounting said bracket on the end of a set shaft so that the lathe centerof the set shaft will lie in the sight line when produced toward saidmeans, whereby the point indicated by looking through the tube and alongsaid sight line will fix the point for the lathe center on the shaft tobe set.

2. In a shaft alining device, a bracket carrying a sighting tube havingmeans for establishing a sight line therein, and means for rotatablymounting said bracket on the end of a set shaft so that the lathe centerof the set shaft will lie in the sight linewhen produced toward saidmeans, said tube betering the bracket so that the tube will lie in thesight line when produced toward said means, whereby a point in a linepassing through the center of the tube and along said sight line willindicate the point'for'the lathe center of the shaft'tobe set.

In testimony whereof I aflix my signature.

LEANDER B. COBB.

